To jingle is to make a sound like pieces of metal jangling together, like those bells people sing about at Christmas. A jingle is also a funny little poem or song.
Have you ever heard a dog's metal tags banging together? That sound is called a jingle. A jingle is a metallic sound — a cowboy's spurs and a set of keys being shaken both jingle. If you drop a bunch of change on the ground, it will jingle. A jingle is also a bit of comic poetry, like a little song. Jingles are often made as advertisements because they tend to be catchy.